Thermal emitter costs the same to run as an oil radiator

Thermal emitter costs the same to run as an oil radiator

Winter arrives, and with it the question every year: which heating system warms the most while spending the least? The short answer, the one that dismantles the thermal emitter's fruta as a supposed low-consumption champion, is that no such thing exists. Any device that heats through electrical resistance — the so-called Joule effect — converts one kilowatt hour into exactly one kilowatt of heat. Not one more. It makes no difference whether it's a refractory-stone emitter, an old-fashioned oil radiator or a black heat panel. Same power, same result, same bill.

The thermal emitter, that appliance many brands sell as cutting-edge technology, is an electric radiator in a different casing. The only real difference is inertia: the stone stores heat and releases it slowly. Comfort, not efficiency. Anyone who promises otherwise is either lying or doesn't understand physics.

Which heating system uses the least energy?

The answer has a technical name: heat pump. An air-conditioning unit with a reverse function extracts heat from the outside air and brings it into the house. For every kilowatt hour it draws, it delivers three or more of heat. The indicator that measures this is the COP, and that's where the magic happens — or rather, well-exploited thermodynamics. Industry figures cite performance ratios of 3.4 in normal conditions, dropping to 2 when the thermometer falls to ten degrees below zero.

The savings are on such a scale that, according to the experience shared in these discussions, a 1.8-kilowatt inverter unit can heat three rooms and keeps working without freezing up at eight degrees below zero. Non-inverter versions, on the other hand, freeze at those temperatures. The difference between paying one euro a day or four is exactly that.

The fine print of extreme cold

A heat pump is not limitless. Its performance drops as the outside air gets colder, and in areas with harsh winters it's worth checking the specifications carefully before relying on it entirely. At very low temperatures, the system loses efficiency and in some cases simply won't start.

That's where the other great victim of the story comes in: butane. A catalytic heater of the kind used in hair salons burns through a gas bottle every five days, about four euros a day, according to a calculation circulating in the debate. More expensive than the heat pump, but without depending on the power grid.

The bill as a battleground

Let's put figures on the table. A forty-square-metre living room, with a heat pump running for ten hours and an outside temperature between two and six degrees, costs roughly one euro a day, according to the calculations discussed in the thread. The same living room with three one-kilowatt oil radiators and a fan heater: four euros a day and still not properly warm. With heating oil, twenty litres a day, twenty euros. The comparison leaves no room for argument.

The catch lies in pure electricity consumption. Air conditioning in heating mode doesn't dry out the air the way emitters do, but some people attribute headaches and dryness to it. And there are those who, having both systems at home, prefer the emitter purely for comfort, even though it costs them more.

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The conclusion that marketing finds uncomfortable: the thermal emitter is not a low-consumption option. It is a comfort option. The energy efficiency label on the box measures something else, and the kilowatt hour still costs the same regardless of the stone that dissipates it. The only way to heat your home while paying less than you spend is not to pay to generate the heat, but to move it.